[Elecraft] Sqelch Settings No Effect and audio listening fatigue and noisy computers.

[goldtr8 at charter.net]

I have enabled the ability to change the sqelch settings to try and 
reduce some of the background static.  However, no matter how I adjust 
it from 0 to 29 it has no effect on the audio.

Is this normal or do I not understand the function in the K3.  In any 
other radio I have owned in the past this would lower the static 
threshold.

To try and improve the audio I have gone to an external equalizer and I 
hope this will help with the hearing fatigue I get with this radio.  I 
am wondering if part of the problem is the Heil pro 2 that I purchased 
with the radio.

I am slowly playing with filter settings, NR, NB ans so on and I can 
definatly pull out signals.  I have been listening all over the bands 
with the contest going on so I can tell the differences.

As a final statement I also had to ditch the tower computer and go to a 
laptop as the computer was putting lots of noise in the system when I 
connected it to the K3 even with a good shielded USB to RS232 converter 
with 6 turns in a 31 mix bead.  I changed to the laptop and this noise 
is not there.

Anyway I am making progress but I would like some ideas on the sqelch.

One final question is there a good users guide that helps to explain all 
the different settings and how making changes affect either RX or TX and 
what are the interactions between these settings.

Thanks in advance for all your help.

KD8NNU
Don